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trace: Add simple built-in tracing backend

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This patch adds a simple tracer which produces binary trace files.  To
try out the simple backend:

$ ./configure --trace-backend=simple
$ make

After running QEMU you can pretty-print the trace:

$ ./simpletrace.py trace-events trace.log

The output of simpletrace.py looks like this:

  qemu_realloc 0.699 ptr=0x24363f0 size=0x3 newptr=0x24363f0
  qemu_free 0.768 ptr=0x24363f0
  ^           ^---- timestamp delta (us)
  |____ trace event name

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

trace: Make trace record fields 64-bit

Explicitly use 64-bit fields in trace records so that timestamps and
magic numbers work for 32-bit host builds.

Includes fixes from Prerna Saxena <prerna@linux.vnet.ibm.com>.

Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Stefan Hajnoczi 2010-05-22 19:24:51 +01:00 • committed by Anthony Liguori
parent 94a420b170
commit 26f7227bfe
8 changed files with 360 additions and 4 deletions
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3
Makefile.objs
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@ -269,6 +269,9 @@ libdis-$(CONFIG_SPARC_DIS) += sparc-dis.o
# trace
trace-obj-y = trace.o
ifeq ($(TRACE_BACKEND),simple)
trace-obj-y += simpletrace.o
endif
vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)